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本文在Ekman动量近似下,推得边界层动力学中的4个伪守恒关系式,且引入Ekman坐标,使问题简化,Ekman坐标中运动呈经典的Ekman流,然后给出了由Ekman坐标中的解回复到物理坐标中的一种近似方法,这种回复过程能反映出系统的非线性,利用这种方法讨论了边界层摩擦对Eady型斜压波及锋生过程的影响。结果表明,由于Ekman动量流具有一定的非地转性,造成了边界层中的锋生,但又因边界层摩擦具有一定的耗散作用,与自由大气相比,边界层中出现间断的时间要增长,锋生过程要减弱,Ekman动量流具有二重性。
In the Ekman momentum approximation, four pseudo-conservation equations in the boundary layer dynamics are deduced and the Ekman coordinates are introduced to simplify the problem. The Ekman coordinates show a classical Ekman flow, and then the Ekman coordinates An approximate method of solution to the physical coordinates is given. The response process reflects the nonlinearity of the system. The influence of the boundary layer friction on the Eady baroclinic and frontogenesis process is discussed. The results show that Ekman momentum flow has a certain non-ground motion, resulting in frontogenesis in the boundary layer, but due to the dissipation of the boundary layer friction, compared with the free atmosphere, the discontinuous time in the boundary layer To grow, the process of frontogenesis should be weakened, Ekman momentum flow has duality.